Breaking the API breaks the web interface

[aldbr]

We need to find a way so that contributors breaking the API adjust the calls in diracx-web.
For the moment we can probably just print a message mentioning diracx-web when breaking changes are introduced in the API, the same way we do it for the diracx-client, it could go in the client_regenerate test.

Later on, we can try to find better solution like having everything in a monorepo (frontend/backend), or may be using git submodules (just throwing some ideas).